Screen for sand and gravel



H. s. EARLE. scam ron SAND AND GRAMEL.

APPLICATION FILED 0C.30.l9t8.

1,418,5 15. PatentedJune 6,1922.

2 suns-sash H. S. EARLE.

SCREEN FOR SAND AND GRAVEL.

APPLICATION FILED nc.a0.. 1918.

1 #118,545. PatentedJune 6,1922.

1 2 SHEETS-SHEET 2- Qttmmaq g r I scnnmv FOR SAND AND GRA'vEL.

the spacing bars.

T 0 all who m tt may concern:

Be it known that I, -HORATIO- SJEARLE, a citizen of the UnitedStates, residing at Detroit, county of Wayne, State of=Michigan, have invented a certain new and useful Improvement. in Screens for Sand and Gravel, and declare the following to be a full, clear, and exact description of the same,

such as will enable others skilled in-the art to which it pertains tomake anduse the same, reference being had to the accompanying drawings, which'form a part-ofgth-is specification. T i

This invention relates'to screens for sand,

I gravel and other material, and-it's object; to provide a screen that is comparatively inexpensive in character and to provide one in which there is a double screening effect. That isthe material, as sand and gravel, is discharged into the interior of the screen discharges material up to 'a' predetermined --size onto an outer fine screen, the larger parts beingdischarged into one receptacle andthat which passes the fine screen being discharged into anotherreceptacle. The invention further has for its object a method of holding and supporting the circumferential wire forming the outer screen in predisposed relation with the inner screen memher which is preferably formed'of a foraminous sheet of metal. .A further object is to 'providea cheap'and efiicient spacing device for holding the circumferential wires form- 'ing'the outer screen. These general objects andthe several novel features ofthe inven-.

tion are hereinafter morefully described and claimed and shown in preferred form in the accompanying drawings in which* Fig. 1 is a vertical longitudinal'section of 40' a screen embodying my invention. a a Fig. 2 is an enlarged cross'section of part of the innerand outer screen members showing the means of supportin'g the outer "screen member by the inner member."-"

Fig. 3 is aplan view-of a portion of the outer screen memberss'howing the method of'supp'orting the wires in predetermined relation. a

of the spacing member. I 4

Fig. 5 is aplan view ofa portion of one of Fig. 6 is an elevation of the member used supporting'the wire fabric on the inner screen member. I

The screen'as shownin Fig. l is preferably perspective of a part I f Specification of Letters Patent. J 6, .1922 ".Application filed December 30,19 18." seria1 '1vo;26s,917. a

cylindrical in form and ma'y be madegreater H orless' length. vas may be .desired'by adding other cylinders in e'ndwise irelationon the shaft; Theprinciple of the invention, how'- ever, 1s disclosed in the. single cylinders here shown. The screen is support'edon a shaft 1 l which may be I conveniently. supported at each end in bearings in the supporting members2. and 3 to hold the shaft at 'aninclina tionto, the horizontal. and provided lwith' mean s'for'rotation thereof (not hereshown). :The inner screenmember is formed pref -j erably of foraminous sheet metal 4 of cy- =lindrical form having'a series ofapertures 5 thereln of predetermined size. Preferably,

for .sand" and: gravel, these apertures are j about three-fourths of an inch-in diameter,

and-if desired, a succeeding cylinder maybe attached to the shaft at the lower. end of the cylinder, 4 having apertures of, the same or Fig. 1; This cylinder 4 issupported by'two or morespiders. 7 having radial arms shaped at theend to pass through aperturesin the vdifferent sizes, such additional cylinderbev ting indicated by the dottedlines 6 shown on plate and tobezsecured'thereonfbyithe nuts. 8.

Surrounding this inner foraminous cyline. der 4 is a cylinder9 formed ofwiresextending circumferentially thereabout andzspaced .a short distance. from the wall of thecylinder 4. Thesewires'may be spaced quite a close together longitudinally of the cylinder as is required to produce the desired fineness of the screened materiaL- The methodof spacing the wiresaisyshown more particularly in Fig. 3."f-rom" which it. will be -observed that aseries of anglebars 10 extend";

of; the angle having" apertures 11- and 12 therein of-a' diameter. to receive the wires l3.'

The metalbetween the two apertures 11- and 12 is slittransversely, and theends thereof turned'upward as indicated'inFig; 4 providf ing upwardly proj ecting'portionsor lugs 14. and 15. 1 The bars arepunched with theparts 14 and 15! upset as indicated to allow each strand of the wireto be inserted into'the. bar

ward as indicated at the right hand side-of the Figs. 4 and 5 tightly engaging the wire.

and thereafter these lugs'are turned down or outwardly bent portion'16 whichportion. I

tion described, particularly theangle plates 16 only seats in the apertures in the bar.. This construction enables the use of a spacing member which may be formed of metal light in weight, strength resulting from the form of the bar which prevents the buckling thereof. Each wire strandl3 is independent.

of each other strand, and the ends thereof .17 and 18 are provided'with hook'portions which are inserted through a slot in a plate 19 asshown in Fig. 2. With the construc- I 2l at :oneend of a size to practically fit a preferably threaded and a :nut' 22 placed thereon-after the wire fabric has been positioned as stated, and'a lock washer may wire. The-bolt, being longitudinally split asshown, maybe opened to allow insertion on the wire until thewire' rests in the aperture. The two-legs of 'the'lbolt are brought together and a cylindrical :he'aded member 23"threaded thereon.- The end of the bolt isthen inserted through an aperturein the plate 4 :and the. cylindrical member .23 turned inward until the head-engages the plate, whereupon further turning by means of the slotted head 50 of thevmember forces the bolt 20 outward and this. movement of all theboltsQO stretchesthe wire' fabric to lace. The inner end of the cylinder :23 is be employed beneath the nut 22. By reason of the practical impossibility of manipulating a nut positioned between the foraminous "plate andthe wire tabric the mechanical arrangement abovef'stated maybe employed which'may be manipulated from the interior of the foraminous cylinder 4, These supe porting members. orfbolts 20,.:bein'g of the 'shape'described, presentv little obstruction to the passage ofxmaterial longitudinally of the screen during-its rotation. There hare-severalof these supporting" members 20 'as indicated in Fig. 1, there being three or more such'members in alignmentlongitudinally of the screen and several such lines sequidistantly. spaced about the cylinder at.

Bythis meansthe screenfabric -is-securely held in desired spaced relationviwith the inner cylinder, and theobstruction presented 'to a flow of material is negligible; 1

In operation, the material from a :sand or gravel bank is discharged into the in- *teri'or otithe screen A: by means of a chute :25 1of suitable design This inner "cylinder iso't a strengthttosustain theweight of ma terial and protects the-outer screen tmember andicthe router sscreenrmember may therefore tion, what-I claim: is

be, of finer wire as there is little liability of disarrangement or distortion of the wires by weight of material discharged thereonto. By use of the foraminous plate the only material discharged into the outer wire screen is that which may pass the inner screen member and thus the outer screen is "relieved from a load ofall that material coarser than what may pass the inner screen. Both' the screen members 'at the lower enddischarge into a conduit 26 while the material that may pass through thevwire member is discharged directly therebeneath into a bin any character and all the material that is coarser than what may pass throughcthe outer screen is discharged'into the conduit 26 or separate'conduit as desired.

"By theconstruction described,1 am able to use-a wire of 'less 'strength' than would be required if all material were initially discharged thereonto, and by theconstruction descnibed, the-screen is very: cheaply assembled" with; the wires uniformly spaced.

The'cross bars "may be very light :in weight dueqto their form -which prevents liability to distort in use. Furthermore, the wire strands are very securely held in the-desired spaced relation and the space between the two screen-members is practically tree from obstruction to How of material except that otthebolt members 20 which are of such character as to'obviate the accumulation of any great quantity of material behind the same.

Having thus "briefly described my inven- 1. A screen fZLbIlC comprising a series of circular wire -strands,=a series of angle bars extending-transversely of the =w1re strands and having equi-distantly spaced seats theretor, 1 the seats being formed by providbig-aperturesin each leg of the angle adjacent the junction point thereof, the metal." between the apertures atthe junction of the :two legs providinga lug adapted to'be bent over and hold the strand in its seat, each strand havingan' outwardly bent portion for seating in the bar,-the' relationship of the bars and strands being such; that the bar is positioned outside the i-area".circumscribed by the inner face of the wire strands. I q y 2. A-screen fabric comprisinga series of circular wire strands, a series of bars of angle cross section in -equidista'ntly spaced relation extending longitudinally of the fabric and having equidistantly spaced seats for the strands, the seats being formed'zby aproviding aperturesineach legof the angle in alignment transversely thereof to-receiive the portion between the apertures of thebar being slit and-bentupwardly prioviding lugs 27-01 it may be discharged intoa conduit of i the strand,- the strand i having an outwardly bent portion for seating in eachbar and 3 adapted'to be turned downward over the wire to secure it in position on its-seat, the

' outwardly bent portions of the strands p0- sitioning the inner face of the angle bar outside the circle formed by the inner face bars extending transversely of the bars, the

bars being provided with seats for the wires and the wireshaving outwardly bent porti'ons eqnidistantly spaced longitudinallythereof for engaging in the said seats, the

bars having integral lugs thereon adapted vto be forced down over the bent portions and the bent portions positioning the inner face of the bar below the inner side of the w1re members.

tion. I

In testimony whereof sign this specifioa HORATIO' s. EARLn-x I 

